<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 :closable="false"(是否展示“X”号) show-icon(显示图标) -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数"
        type="warning"
        :closable="false"
        show-icon
      >
      </el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            expandTrigger="hover"
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
            clearable
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 将标签页改为many -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            size="mini"
            type="primary"
            :disabled="isButtonDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环生成的el-tag -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(scope.row, i)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 显示按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 将标签页改为only -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            size="mini"
            type="primary"
            :disabled="isButtonDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环生成的el-tag -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(scope.row, i)"
                  >{{ item }}</el-tag
                >
                <!-- 输入文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <!-- 显示按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数或属性对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加表单 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数或属性对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加表单 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      cateList: [],
      //用户在级联下拉菜单中选中的分类id
      selectedCateKeys: [],
      //配置级联菜单中数据如何展示
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      activeName: "many",
      //用来保存动态参数数据
      manyTableData: [],
      //用来保存静态属性数据
      onlyTableData: [],
      //控制添加参数.属性对话框的显示或隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },
      //添加表单验证规则
      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      editDialogVisible: false,
      //   修改的表单的数据
      editForm: {
        attr_name: "",
        atrr_id: "",
      },
      //   修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      // 控制文本框与按钮的切换显示
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      //获取所有的商品分类列表
      const { data: res } = await this.$http.get("categories");

      if (res.meta.status !== 200) {
        return this.$message.error("获取分类数据失败");
      }
      //将数据列表赋值给cateList
      this.cateList = res.data;
      // //保存总数据条数
      // this.total = res.data.total
      //   console.log(res.data);
    },
    handleChange() {
      this.getParamsData();
    },
    async getParamsData() {
      if (this.selectedCateKeys.length != 3) {
        this.selectedCateKeys = [];
        this.manyTableData = [];
        this.onlyTableData = [];
        return;
      }

      //当用户在级联菜单中选择内容改变时触发
      console.log(this.selectedCateKeys);
      //发送请求，根据用户选择的三级分类和面板获取参数数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数列表数据失败");
      }
      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals.split(",");
        item.inputVisible = false;
        item.inputValue = "";
      });

      console.log(res.data);
      if (this.activeName === "many") {
        //获取的是动态参数
        this.manyTableData = res.data;
      } else if (this.activeName === "only") {
        //获取的是静态属性
        this.onlyTableData = res.data;
      }
    },
    handleTabClick() {
      this.getParamsData();
    },
    addParams() {
      //当用户点击对话框中的确定时，校验表单
      this.$refs.addFormRef.validate(async (valid) => {
        //校验不通过，return
        if (!valid) return;
        //校验通过，发送请求完成添加参数或者属性
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
            attr_vals: "a,b,c",
          }
        );

        console.log(res);
        if (res.meta.status !== 201) {
          return this.$message.error("添加" + this.titleText + "数据失败");
        }
        this.$message.success("添加" + this.titleText + "数据成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    addDialogClosed() {
      this.$refs.addFormRef.resetFields();
    },
    async showEditDialog(attr_id) {
      //发起请求获取需要修改的那个参数数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        { params: { attr_sel: this.activeName } }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数数据失败");
      }
      this.editForm = res.data;
      //显示修改参数.属性对话框
      this.editDialogVisible = true;
    },
    // 重置修改的表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮,修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) return;

        //发送请求完成修改
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("获取参数数据失败");
        }
        this.$message.success("修改" + this.titleText + "数据成功");
        this.editDialogVisible = false;
        this.handleChange();
      });
    },
    async removeParams(attr_id) {
      //根据id删除对应的参数或属性
      //弹窗提示用户是否要删除
      const confirmResult = await this.$confirm(
        "请问是否要删除该" + this.titleText,
        "删除提示",
        {
          confirmButtonText: "确认删除",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      //如果用户点击确认，则confirmResult 为'confirm'
      //如果用户点击取消, 则confirmResult获取的就是catch的错误消息'cancel'
      if (confirmResult != "confirm") {
        return this.$message.info("已经取消删除");
      }

      //没有取消就是要删除，发送请求完成删除
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );

      if (res.meta.status !== 200) {
        return this.$message.error("删除参数数据失败");
      }
      this.$message.success("删除" + this.titleText + "数据成功");
      this.handleChange();
    },
    // 文本框失去焦点或按下回车键
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = "";
        row.inputVisible = false;
        return;
      }
      //如果用户输入了真实合法的数据，需要保存起来
      row.attr_vals.push(row.inputValue.trim());
      row.inputValue = "";
      row.inputVisible = false;

      this.saveAttrVals(row);
    },
    // 切换文本框显示
    showInput(row) {
      row.inputVisible = true;
      // 自动获取焦点
      // $nextTick方法的作用是当页面上元素被重新渲染之后，在执行回调
      this.$nextTick((_) => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    async saveAttrVals(row) {
      //封装函数，完成保存可选项的操作
      //发起请求，保存参数细项
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(","),
        }
      );

      if (res.meta.status !== 200) {
        return this.$message.error("修改参数项失败");
      }

      this.$message.success("修改参数项成功");
    },
    handleClose(row, tag) {
      row.attr_vals.splice(tag, 1);
      this.saveAttrVals(row);
    },
  },
  computed: {
    isButtonDisabled() {
      return this.selectedCateKeys.length !== 3;
    },
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[this.selectedCateKeys.length - 1];
      }
      return null;
    },
    titleText() {
      if (this.activeName === "many") {
        return "动态参数";
      }
      return "静态属性";
    },
  },
};
</script>

<style lang="less" scoped>
.el-input {
  width: 120px;
}

.el-tag {
  margin-right: 10px;
}
</style>